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5 Activity 11 Topic 1 Respiratory system © 2007 Stewart Chenery, Sally Goodwin, Claire Moody, Beverly Rickwood Page 1 of 2 5 Activity 11 Topic 1 Alveolus Bronchioles Bronchus Rib muscles Ribs Trachea Diaphragm A thin sheet of muscle that contracts and relaxes during breathing Also known as the windpipe – air is drawn in through the nose and down this tube Bones that protect the lungs The muscles between the ribs that move the ribs during inhalation and exhalation Tiny air sac where gas exchange occurs Where the trachea branches into two Smaller, thinner vessels that take air deep into the lungs © 2007 Stewart Chenery, Sally Goodwin, Claire Moody, Beverly Rickwood Page 2 of 2